02 At the Beginning of Perception

02 At the Beginning of Perception - 1 At the beginning...

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9/6/2016 1 At the beginning of [visual] perception WEEK 02 Lecture The (basic) neuron Visual sensation Light transformation Lens Accommodation Photoreceptors & light transduction The perceptual process (review) The neuron Nervous System 1800s Nervous system and electrical impulses Think Mary Shelley’s Frankenstein; or the Modern Prometheus Nerve net Nervous System Camillo Golgi Anatomist Staining method: could identify neurons from other tissue Santiago Ramon y Cajal Refined staining method: could identify specific neurons! Neuron doctrine Neuron Doctrine A central idea of neuroscience: The nervous system as a processor is composed of many individual processing units (i.e. neurons). Golgi stain The neuron The neuron The neuron 1 2 3 4 5 6 7 8 9 10 11
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9/6/2016 2 The neuron Neurons transmit chemical signals to other neurons Release neurotransmitters in a small gap between terminal and dendrite synapse A closer look… The neuron The neuron Dendrites receive signals from a presynaptic neuron Excitatory Inhibitory Cell body gathers these signals Axon hillock If excitatory signals reach a threshold, then neuron fires (otherwise, does not)
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